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fittest %iate5 Jenn M. 001313, on BELOITQWISCONSIN.

Letters Patent No. 111,611, dated February 7, 1271.

IMPROVEMENT lhl THE MANUFACTURE OF S'TRAW-BOARD FOR THE- CONSTRUCTION OF BUILDINGS.

The-Schedule referred to in these Letters Patent and making part of the same.-

To all whom it may concern:

.Be it known that I, JUDD M. GOBB,, of Beloit, in the county of Rock and State of Wisconsin, have invented-a new and useful Prepared Plastering-Board; and I do. herebydeelare thefollowingttobe a full, clear, and exact description thereof, which will enable others Skilled in the art to which my invention appertains to makeand use the same.

My invention has for its object to provide an improvedcov'ering .for the walls and ceilings of buildings as a substitute for laths and plaster, and an exterior covering to be employed inplaee of boards and siding.

In the formation of what is termed building-board,

vto wit, a thick straw-board made in continuous lengths base for roofing, it cannot be practically applicd to the interior in place of laths. and plaster, for the rcason that the odor of the "tBJI l S olTensive, particularly in winter, when fires are i neeessarilv employed for heating purposes.

My. invention consists in treating the board with water-proof material in the following manner, to render it applicable to the interior of dwellings, and in its further manipulation to adapt it for siding. 1

After leaving the driers, and 'while still; warm, the upper surfaceof the board is coated with oil, the latter being delivered to a rol er or other suitable device for spreading it uniformly. Owing to the warmth of the board the oil. is readely absorbed, and forms the base of the water-proofing.

From the spreading-roller the board is passed through a vat containing warm linseed-oil and resin,

mixed in about equal proportions, by which both sidesare coated.

After leaving this mixture-it is carried to the calenders, first passing between suitable scrapers so arranged as to scrape the superfluous compound from both sides.

'lhe calender-s then stretch and press the board suf-' The object in treating the board first uponone side is to saturate it to a considerable degree with a cheap oil, which shall form the base of the water-proofing, so that it shall not absorb too large a quantity of the more. expensive compound of oil and resin. I am enabled, therefore, to cheapen the cost of manufacture materially.

By this treatment, also, the sides of theboard differ in appearance and degree of finish, the side first treated forming the back and the opposite side the face. 'lhe ibrmerbeing treated with a base of oil before the final coating, presents a dead surface, while the latter receiving only the compound, possesses a glazed coating of considerable fineness. Instead of putting the cheap oil upon the upper surface of the board, it may be applied to its under side with equal citizen-and it is apparent that waterv proof materials other than resin may be .used in connection with the oil'in the manner described, and be productive of substantially the same results. f

In the manufacture of all water-proof board or paper that is wound into rolls for shipment, the water-proof materialemployed is of such a sticky or adhesive nature that frequently, when attempting to unwind the rolls, the board or paper is torn and injured. This difficulty is greatly increased by the manner in which the board or paper is treated inits mani'ifacture, viz: by beingsaturated with the waterproofing as it leaves the paper-machine, and-immediately wound into rolls before being thoronghly dried,

By my invention thesedifficnlties are entirely overcome, as the oil furnishes a non-adhering surface to the board, so that, when the rolls are unwound, there is no danger of their being torn or injured.

Stra'w or plastering-board prepared in accordance I with my invention-is entirely inodorons, and is not,

like plain or unsaturated board, liable to warp under the influence of moisture when employed as an exterior covering, or when nailed to the studding in place of laths and plaster.

the apply the plastering-board, it shouldbe out into suitable lengths andthe edges trimmed square; These strips are then met evenly on both sides and rolled up, being allowed to stand on the edge untilthoroughly dampened. .Treated in this way it swells slightly, and "when put on and dried shrinks down smooth,

When thus prepared it is tacked upou'both edges to the walls, commencing at the top. It may also be tacked in the center occasionally. v

After one strip isapjplied another is put on-in the same way, keeping the edges .close together without lapping, the joints and tack-heads being afterward covered with narrow strips of cloth or paper. After the board thus applied is thoroughly dried, it may be covered with wall-paper or painted, as preferred.

In preparing the board as a substitute for siding, it is out by suitable machinery into narrow strips of uniform width, either before or after being rolled, and applied to the exterior boards or studs by nailing, as in ordinary siding. p

The heavy, wide rolls could not well be used for this purpose, inasmuch as their weight would render them ditfieult to handle, and their width produce an unfinished appearance, besides renderingthem liable to injury from the weather, because a greater surface of each board would be exposed.

J. BRITTAN, FRANK II.- SMiTH. 

